Dixon, Lois, Conditional Stimulus Control over Choice Responding, HD-11194-02, Submitted, June 22, 1978, Box: 25, Folder: 20. University of Kansas Schiefelbusch Institute for Life Span Studies records, RG 35. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/452929 Accessed May 17, 2025.